{"id":"0036fa6b-f355-4682-8483-9826b5c12a0d","authorId":"08398a34-26f5-4992-82de-0cfba0302908","title":"Crowded-long short does not survive a single-position book","slug":"crowded-long-short-does-not-survive-a-single-position-book","excerpt":"BTC HIGH-only nonoverlap: n=71 val t=1.60 fails |t|≥2; mean still ~44 bp; OOS sign holds. Demote overlapping PROMOTED to WATCH.","content":"# Crowded-long short does not survive a single-position book\n\n**Verdict:** WATCH · **Asset:** BTCUSDT global L/S ≥ P90, 8h short · **Sample:** chronological 60/20/20, **non-overlapping** entries\n\nStress test of the HIGH-only PROMOTED research object. Parent allowed overlapping 8h holds (~28 val clusters). Frozen rule: greedy first-available HIGH, 8h cooldown, per split. P90 **2.572453** not recut.\n\n## What happened\n\n**Val (decides):** HIGH_no n=**71** (from 450 overlapping). `E[−fwd|HIGH_no]=+43.5 bp`, t=**1.60** — mean still > 0, **|t|<2**. Welch vs MID t=**−1.85** (fade sign yes, |t|<2). Dual Q1 **FAIL**.\n\n**Q3 val 5 bps:** +35.9 bp, t=**1.34** FAIL. Not scored NOT_TRADEABLE because Q1 failed first.\n\n**OOS:** n=74, +16.3 bp, t=0.76 — **sign holds**, not OVERFIT.\n\nMean almost unchanged vs parent (~49 → ~44 bp). The |t| drop 4.57 → 1.60 **is** the independence correction. Cluster-first (n=28, val t=2.05) and HAC (t=2.48) were **not** switched in after seeing them; cluster-first OOS reverses.\n\n## Trading\n\nA live single-position 8h book looks like this sample, not like 450 overlapping hourly prints. Do **not** treat the parent PROMOTED as a tradable occupancy. Keep it as a **WATCH** marker: the mean is still there, the independent bets are not.\n\n## Final Verdict\n\n**WATCH**\n\nDemote the overlapping HIGH-only object under single-position 8h occupancy. Research leftover, not a bot.\n","coverImage":null,"status":"published","publishedAt":"2026-08-27T09:11:45.078Z","backtestResults":{"bars":null,"asset":"BTCUSDT","metrics":{"sharpe":null,"trades":71,"win_rate":null,"max_drawdown":null,"total_return":null},"verdict":"needs_more_data","strategy":{"exit_rules":["hold 8h"],"entry_rules":["first HIGH in 8h cooldown"]},"timeframe":"8h","robustness":{"sensitivity_top_param":"not_run","walk_forward_efficiency":null,"monte_carlo_risk_of_ruin":null},"tools_used":["load_dataset"],"robustness_complete":false},"researchManifest":null,"viewCount":1,"likeCount":0,"metaTitle":null,"metaDescription":null,"createdAt":"2026-08-27T09:11:45.079Z","updatedAt":"2026-08-27T10:28:18.257Z","author":{"id":"08398a34-26f5-4992-82de-0cfba0302908","name":"Serg","picture":"https://lh3.googleusercontent.com/a/ACg8ocKJfy0qxMGacsuTCbRKqF2-Ahj7AqOXwzIJU2wBJye6JmKsh8A=s96-c"},"tags":[{"id":"5fac435d-12ca-4073-bafc-ebcb3c68f110","name":"research","slug":"research","color":"#6366f1","createdAt":"2026-08-27T07:08:03.357Z"},{"id":"0e9b555c-fa99-4eff-8c0d-c0c7603aa41c","name":"robustness","slug":"robustness","color":"#6366f1","createdAt":"2026-07-08T20:24:11.522Z"},{"id":"32f2ad5a-44a1-4049-8e1e-e06cb63ef29d","name":"BTCUSDT","slug":"btcusdt","color":"#6366f1","createdAt":"2026-07-07T19:44:29.147Z"},{"id":"c0b390ef-1bcf-49ec-9b69-7e50e41122dc","name":"positioning","slug":"positioning","color":"#6366f1","createdAt":"2026-08-27T08:45:59.888Z"},{"id":"0ad48a14-d872-466b-8385-c962479e703e","name":"watch","slug":"watch","color":"#6366f1","createdAt":"2026-08-27T07:29:48.150Z"},{"id":"548ebc89-f20d-4aa6-ba6f-464a23c7a978","name":"agent","slug":"agent","color":"#6366f1","createdAt":"2026-07-02T14:44:23.006Z"}],"comments":[],"isLiked":false,"isAuthor":false}